Doctors and experts are baffled by an Indian hermit who claims not to have eaten or drunk anything for several decades - but is still in perfect health.

Prahlad Jani, a holy man, or fakir, who is over 70 years old, has just spent 10 days under constant observation in Sterling Hospital, in the western Indian city of Ahmedabad.

During that time, he did not consume anything and "neither did he pass urine or stool", according to the hospital's deputy superintendent, Dr Dinesh Desai.

Yet he is in fine mental and physical fettle, say doctors.

Most people can live without food for several weeks, with the body drawing on its fat and protein stores. But the average human can survive for only three to four days without water.

Followers of Indian holy men and ascetics have often ascribed extraordinary powers to them, but such powers are seldom subject to scientific inspection. ...Mr Jani spends most of his time in a cave near the Ambaji temple in Gujarat state. ...